01 -
Combine 1 cup of cold water and granulated sugar in a saucepan over medium heat. Stir until the sugar fully dissolves to form a clear syrup.
02 -
Remove the saucepan from heat and set aside, allowing the syrup to cool completely before use.
03 -
In a large pitcher, add the cooled syrup, remaining 3 cups of cold water, blue raspberry syrup, and chilled lemon juice. Stir thoroughly until well combined.
04 -
Taste the lemonade and adjust sweetness or tartness by adding more sugar or lemon juice according to preference.
05 -
Pour the blue raspberry lemonade over ice cubes into glasses and garnish each serving with lemon slices.